Naval Architecture (INAV)

The Naval Architecture Operating Unit develops its research activity mainly in the sectors of Naval Architecture encompassing numerical and experimental investigations (in model and full scale) on the hydrodynamics of ships, propellers and other propulsors, on ship stability and manoeuvrability, and on the design and analysis of ship structures and of their performances.

Results of the aforementioned research are at the basis of research activities aimed at design and optimization of unconventional ships and marine vehicles.

For the experimental activities, the operating unit makes use of large laboratories such as the towing tank, the cavitation tunnel for testing the propellers, the marine structures testing lab and, more recently, the drives and experimental automation laboratory for marine systems. Some research topics underway or developed in recent years are listed below.

 

Hydrodynamic performances

Study of ship motions and added resistance in waves in relation to the sea state through numerical methods (mainly developed in house). Experimental study of the motion resistance of hulls in the model testing tank. Study of motion resistance via numerical methodologies (RANSE and potential methods). Experimental study by cavitation tunnel and theoretical study of naval thrusters for the optimization of their efficiency (counter-rotating propellers, CLT propellers, other means for increasing the efficiency of traditional propellers). Single and multi-objective optimization of mono hulls and innovative multi hulls through numerical calculation tools, both commercially available or in-house developed.

 

Noise reduction

Experimental study (in the structures laboratory and in full scale) and theoretical study of the dynamic behavior of ship structures, with the aim of optimizing the design, reducing the noise radiated inside the ship and outside (in air and in water).

Experimental surveys of radiated noise in air and in water, numerical models for propagation, prediction models for ship traffic noise in water

Experimental study (at the cavitation tunnel) and theoretical study of high performance propellers, alternative thrusters (pumpjet, mantle propellers) and hydrofoil profiles in relation to cavitation, vortices formation, the generated pressure and the radiated noise field.

 

Maneuverability and dynamic positioning

Study and development of semi-empirical and numerical methodologies for the prediction of the manoeuvrability of ship (one or two propellers) and for the design and sizing of the dynamic positioning system based on prescribed operating specifications.

 

Structures and materials

Fatigue study of welded structures through experimental tests and FEM code calculations. Characterization of composite materials in an intact and damaged conditions through experimental tests and through finite elements models.

Development of regulations for the construction and operation of the ship.

Structural monitoring to support management and regulatory development

Inspection and structural monitoring of ships during construction and operation.

Measurement and analysis of actions on ship and marine structures.

Numerical and experimental analysis of the sailing system of large ships.

Numerical analysis of fluid / structure interaction (FSI).

Platforms for "offshore renewable energies" and unconventional marine vehicles.

 

Performance of marine mechanical drives

Dynamic analysis of marine drives, with particular reference to the interactions between machinery and structure.

Dynamic analysis of machinery parts in primary and secondary drive lines, with performance monitoring.

Experimental analysis of vibro-acoustic phenomena related to the operation of mechanical drive-lines.

Experimental modal analysis for dynamic identification.

Correlations between vibratory phenomena and acoustic propagation.

Innovative hydraulic systems with load sensing characteristics for marine applications.

Optimization of the system performances associated with the energy saving of fluid based drive lines.

 

Safety and design regulations

Participation in international committees concerning the development of regulations relating to the buoyancy and stability of ships both intact and damaged, the maneuverability of ships, hull scantling. Impact of these new safety regulations on the philosophy of the ship design process.

Participation in the appropriate international committees in the development of regulations concerning. Impact of these new safety regulations on the ship design process.

 

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Referent:

Enrico Rizzuto

Afferents:

Dario Boote, Marco Ferrando, Marco Gaiotti, Tomaso Gaggero, Paola Gualeni, Cesare M. Rizzo, Michele Viviani, Stefano Gaggero, Diego Villa, Benedetto Piaggio, Giuliano Vernengo, Tatiana Pais, Giorgio Tani

 

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 Università degli Studi
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